In another thread I mentioned this little book, MASTER TREE FINDER by May Theilgaard Watts, what an invaluable book it is for identifying trees. IT'S STILL IN PRINT!!! The Publisher is Nature Study Guild. I did a search and found them, their at
www.naturestudy.com and they sell this little book for $3.50! and a discount for volume to boot! They also have similar guides for the Northwest, the Southwest, Flower Identification and lots more! If you don't have a copy you really should get one...incredible little 4"x6"x3/16" book 60 pages long.
Wade